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Financial instruments - Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value of Financial Instruments [Line Items] |  |
Notes payable to related party | $ 25,808 | $ 30,493
Interest rate swaps designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 7,015 |
Cross-currency swap designated as a net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 55,543 |
Level 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,753,210 | 1,708,683
Total financial assets | 1,753,210 | 1,708,683
Long-term debt | 2,418,580 | 2,316,586
Convertible debentures | 519 | 623
Total financial liabilities | 2,419,099 | 2,317,209
Level 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value |  | 20,015
Development loans and other receivables | 33,286 | 31,088
Total derivative instruments | 5,260 | 194
Total financial assets | 38,546 | 51,297
Long-term debt | 4,125,352 | 2,823,473
Notes payable to related party | 25,808 | 30,493
Convertible debentures | 0 |
Total derivative instruments | 58,614 | 104,481
Total financial liabilities | 4,224,354 | 2,974,012
Level 2 | Interest rate swaps designated as a hedge | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,581 |
Total derivative instruments | 7,008 | 19,649
Level 2 | Commodity contracts for regulated operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,721 | 194
Total derivative instruments | 1,348 | 614
Level 2 | Cross-currency swap designated as a net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,958 |
Level 2 | Cross-currency swap designated as a net investment hedge | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 50,258 | 84,218
Level 2 | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 14,580 | 15,565
Level 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 95,246 | 110,514
Development loans and other receivables |  | 0
Total derivative instruments | 15,362 | 51,913
Total financial assets | 110,608 | 162,427
Total derivative instruments | 61,631 | 5,929
Total financial liabilities | 61,631 | 5,929
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 15,362 | 51,525
Total derivative instruments | 60,462 | 5,597
Level 3 | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,169 |
Level 3 | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 388
Total derivative instruments |  | 332
Carrying amount |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,848,456 | 1,839,212
Development loans and other receivables | 32,261 | 23,804
Total derivative instruments | 20,622 | 52,107
Total financial assets | 1,901,339 | 1,915,123
Long-term debt | 6,211,375 | 4,538,470
Notes payable to related party |  | 30,493
Convertible debentures | 277 | 295
Total derivative instruments | 120,245 | 110,410
Total financial liabilities | 6,371,053 | 4,693,366
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 15,362 | 51,525
Total derivative instruments | 60,462 | 5,597
Carrying amount | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,169 |
Carrying amount | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 388
Total derivative instruments |  | 332
Carrying amount | Interest rate swaps designated as a hedge | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,581 |
Total derivative instruments | 7,008 | 19,649
Carrying amount | Commodity contracts for regulated operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,721 | 194
Total derivative instruments | 1,348 | 614
Carrying amount | Cross-currency swap designated as a net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,958 |
Carrying amount | Cross-currency swap designated as a net investment hedge | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 50,258 | 84,218
Carrying amount | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | 13,348 | 13,698
Fair value |  |
Fair Value of Financial Instruments [Line Items] |  |
Long-term investments carried at fair value | 1,848,456 | 1,839,212
Development loans and other receivables | 33,286 | 31,088
Total derivative instruments | 20,622 | 52,107
Total financial assets | 1,902,364 | 1,922,407
Long-term debt | 6,543,933 | 5,140,059
Notes payable to related party | 25,808 | 30,493
Convertible debentures | 519 | 623
Total derivative instruments | 120,245 | 110,410
Total financial liabilities | 6,705,085 | 5,297,150
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 15,362 | 51,525
Total derivative instruments | 60,462 | 5,597
Fair value | Energy contracts | Not designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,169 |
Fair value | Energy contracts | Not designated as a hedge | Cash flow hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments |  | 388
Total derivative instruments |  | 332
Fair value | Interest rate swaps designated as a hedge | Designated as a hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,581 |
Total derivative instruments | 7,008 | 19,649
Fair value | Commodity contracts for regulated operations |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,721 | 194
Total derivative instruments | 1,348 | 614
Fair value | Cross-currency swap designated as a net investment hedge |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 1,958 |
Fair value | Cross-currency swap designated as a net investment hedge | Designated as a hedge | Net Investment Hedging |  |
Fair Value of Financial Instruments [Line Items] |  |
Total derivative instruments | 50,258 | 84,218
Fair value | Series C Preferred Stock |  |
Fair Value of Financial Instruments [Line Items] |  |
Preferred shares, Series C | $ 14,580 | $ 15,565

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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